Punching press



March 4,1930. STROUT 1,749,398

PUNCHING PRESS Filed May 21, 1928 2 Sheets-Sheet 1 Fly 3.

INVENTOR MMM By Atlomeys,

R. w. s T RouT PUNCHING PRESS March 4, 1930.

Filed May 21, 1928 2 Sheets-Sheet 2 INVENTOR By Atlomeys,

@noue W mm 5 Patented Mar. 4, 1930 UNITED STATES PATENT: OFFICE ROBERT w.

OF BROOKLYN, NEW YORK, A CORPORATION OF DELAWARE PUNGHING PRESS Application filed May 21,

This invention provides a power press for punching, corrugating, or other work on sheet-metal or analogous material. .It is especially designed for short-stroke presses operating at high speed. The lIlVGIltlOILRIO- vides an improved construction of such presses affording great compactness and great strength in proportion to the weight. The novel features of the press will be developed as the description'pro'ceeds.

The accompanying drawin s illustrate a press which constitutes the pre erred embodiment of the invention.

Fig. 1 is a front elevation of the press. Fig. 2 is a vertical transverse mid-section on the line 2-2 in Fig. 3.

Fig. 3 is a horizontal transverse section on the line 33 in Fig. 2. i

Fig. 4 is an elevation of the barrel member of the slide. i

Fig. 5 is a front elevation-of the clamping plug.

Fig. 6 is a plan of said plug. Fig. 7 is a vertical section c rresponding to a fragment of Fig. 2, showing a modified construction.

Fig. 8 is a plan of the inner portion of the device shown in Fig. 7.

The press illustrated has a suitably massive frame comprising a base A made preferably in two parts,' a bed B, upright side frame C C, and a head or crown D; the members B,-G, D are united and strengthened against the strainsexerted in punching by four tie-rods E E. Between the side frames 0 C is guided a punch-carrying slide F which is reciprocated from an eccentric (orcrank) on the main shaft G which extends across the machine, being mounted in bearings between the side frames C C and the crown D. The shaft G is adapted to receive a pulley or other means for rotating it, which may be connected to the shaft in any suitable way, as, for example, by any well-known clutch within its hub, by which the continuously revolving fly-wheel may be coupled to the shaft on pressing a treadle or other device to turn the shaft with the pulley for one or more revolutions, as is well known. In the construction 50 shown, the shaft is formed with an eccentric 1928. Serial No. 279,413.

sermons, on BnooxLYmiInw YORK, assrenon T0 1:. w. BLISS COMPANY,

spherical boss K which is received in a preferably spherical socket L formed in a barrel M which is adjustably connected to the slide F preferably by'forming it with an external screw-thread engaging an internal thread in a cylindrical vertical bore in the slide, so that by rotating the barrel M it is screwed up or .down in the non-rotative slide. The barrel M has within it a ring N engaging the upper part of the sphere K, as shown in Fig. 2, and

held down into engagement with'it by an overhanging ring cap 0 which is screwed down upon the topof the barrel. Thus, as the eccentric revolves the connecting rod J,

acting through its boss or sphere K, transmits vertical reciprocating movements'to the barrel M and thereby to the slide F.

In presses of this character the necessary vertical adjustment of the punch or the punch: carrying slide or member has almost invariably been accomplished by providing an adjustment in the length of the connecting rod whereby the slide is driven from the crank or eccentric on the main shaft, so that the connecting rod has been adjustable in length usually by means of a screw which is turned to accomplish the adjustment and then locked by means of a set nut. The present invention departs from such construction and makes the adjustment between the point of conneq tion of the connecting rod with the slide and the portion or member of the slide which carries the'punch or other tool or die. Thus, by making the connecting rod J in one piece from the eccentric down, its construction is made very simple, rigid, and compact. To adjust the slide up or dowuit is only neces sary to rotate the barrel .M, which is then set fast to the slide to preserve the adjustment. Thus, the screw adjustment is provided between the two members of the slide instead of between two members constituting together the connecting rod.

For fastening the barrel M to the slide after adjustment, various expedients may be slip over screwthreaded studs 12 b and is held in place by nuts screwed on these studs. By tightening these nuts it is forced in, so that its-inner end bears against the outer part of the barrel M and holds the latter securely against rotation. vIt is preferable to form the inner end of the plug with screwthreads constituting a continuation of the screw threads cut in the interior of the slide; and for this purpose the plug is'inserted and fastened securely in place in the slide before the internal threading of the latter is performed so that the threads are cut continuously within the opening in the slide-and across the inner end of the plug. At this time the plug is held fixedly in position with its outer flange a somewhat removed from the outer face of the slide, which may be done by inserting between them temporarily any suitable filling pieces, such as washers; after the screwthreading the plug is removed, these filling pieces are taken off,-and the plug is replaced,

' surface of so that when forced tightly in by screwing up the nuts, its inner screwthreaded end will bear upon the screwthreads upon the exterior the barrel and thereby hold the latter securely against rotation.

To adjust the slide it is only necessary to slacken'ofl' the nuts on the studs 6 and then turn the barrel M in the proper direction until the desired adjustment is accomplished,

This turning of the barrel may be performed by any suitable spanner or other tool engaging holes 0 in the upper flange d of the barrel.

The, connecting rod J is shown as'formed integrally with the lower half of the eye engaging the eccentric, -while the upper half of the latter is .formed as a cap J bolted to the main member of the connecting rod, which is a suitable construction.

The slide F is guided within the side frames C C by the construction best shown in Fig. 3. The slide has at opposite sides (and preferably in the vertical plane of the axis of the main shaft) projecting ribs Q, Q, which are guidedbetween a fixed guiding surface or slideway d on one side of each, and an adjustable guiding surface 'or slideway e formed'by a gib located on the opposite side. The gibs e are the usual wedge-shaped type of gib having an adjusting screw f for setting it up or down in the well-known manner. The slide is thus guided by the stationary guide portions d, e to ,prevent displacement to the fron or rear. Displacement to either side is prevented by a rib R formed on the rear of the slide, being engaged bean exterior crosshead tween stationary, and adjustable guiding portionsg and h, the latter being best constructed as a gib adjustable by means of a as part of the side frames 0 C, the same members supporting. 'the wedging planes against which the gibs e e are adjusted. These wedging planes are formed on separate pieces 0' which are bolted fast to the cross frames S S, so that by removing them a clear space is afforded whereby the slide F may be taken out,through the front of the machine and without dismounting its framing. The parts a are seatedin place against solid shoulders to resist any forward thrust against the gibs. The rear fixed guide 9 is conveniently formed on a transverse frame T'extended across the rear between the respective side frames C C, as shown in Fig. 3, and the gib h has a backing engagement with an inclined or wedging surface formed on the same transverse frame. It will be understood that, following the usual practice, the guiding surfaces d, e and g, h, are extended vertically sufficiently to afford a suitably long bearing for guidingthe slide in its vertical movements.

The press is shown as provided with springs U U for more or less counterbalancing the weight of the slide F. These springs may be applied in any usual manner, as, for example, bythe construction shown in Patent No. 1,552,228, dated September 1, 1925.

The construction herein shown, and described may be'varied by the exercise of mechanical skill or according to varying requirements of different engineering designs. An example of one modification which may be applied is that instead of the boss K being made a sphere, it may be made a segment of a cylinder and turn in a correspondinglyshaped socket, as shown in Fig. 7 {Where the cylindrical boss is lettered K and the socketpiece is lettered V. The socket-piece V is in turn set into a cylindrical socket in the barrel, here lettered M. The socket-piece V is externally cylindrical on a vertical axis to fit within the barrel and permit the latter to be rotated, since the socket-piece V cannot rotate because of its engagement with the fiat ends of the cylindrical boss K.

I claim as my invention:-

1. A press comprising an upright. frame, a reciprocating slide guided therein, an operating shaft, and a connecting rod of invariable length transmitting movement from said of the slide may be set to varying vertical adjustments.

2. A press comprising an upright frame,- a reciprocating slide guided therein, an operating shaft, and a connecting rod of invariable length transmitting movement from said shaft to the slide, the slide comprising two members, one of which has pivotal engagement with the connecting rod and has a screw-threaded engagement with the other member whereby to adjust the other member up or down.

3. A press according to claim 1, the connecting rod having a spherical boss at its lower end, and the slide-member pivotally engaged therewith having a spherical socket receiving the spherical boss.

4. A press according to claim 1, the connecting rod having a spherical boss at its lower end, and theslidemember pivotally engaged therewith having a spherical socket receiving the spherical boss.

5. A press according to claim 1, the slidemembers having means for locking them together after adjustment.

6. A press according to claim 1, the slidemembers having means for looking them toether after adjustment, comprising a plug tting within a socket in one member and bearing against the'other member.

. A press according to claim 2, the slidemembers having means for locking them together after adjustment, comprising a plug fitting within a socket in the outer member, having its inner end screw-threaded coincidently with the threads in said member, and

adapted to be forced into clamping engage- I lm'ent with the threads on the inner mem In witness whereof, I have hereunto signed I my name.

ROBERT w. .STROUT. 

